We have several Blackberries in our firm, all 7750 and 7250 models. This error only occurs on our 7250 models. We also have a Blackberry Enterprise Server. There is never a single solution to fix the "transaction error - decryption error" message. When this problem comes up, the user can still receive email on his Blackberry, he just can't send email from his Blackberry. We've talked to Verizon Wireless tech support, and Blackberry tech support. Sometimes we fix it by manually updating the encryption key. Sometimes we need to do a reboot, recreate the encryption key, and then sync. Now I have two devices that I cannot fix with these solutions.

We have a Blackberry Enterprise Server v.3.6. The 7750 models (Which do not give us this problem) are running 3.6 desktop software. The 7250 models come with 4.0 desktop software. Verizon Wireless tech support assures us that running Desktop Manager v. 4.0 with BES 3.6 works just fine, and it is not an issue. But the only devices that keep giving us this "decryption error" are the devices running on 4.0 desktop software. Does anyone know if there is a known issue using v. 4.0 desktop software with v. 3.6 Enterprise Software?

Any ideas on fixing the "Transaction error - Decryption error" when sending email from the Blackberry?

The only solution that I have seen is to uninstall the desktop and handheld managers from the users computer and reboot. Then remove them from the BES, delete all the Desktop service books from the handheld and run DBclean.exe on the users C: drive. The DBclean will clean the registry and such. Then reboot, install all the BB managers, add the user back to the BES and sync...this will create a new encryption key and you are good to go.